Recent Breakup

I ended a really unhealthy relationship in July - I was his sole emotional support, and in the three or so years I knew him he told me multiple times that if it weren't for me, he would kill himself. He wasn't suicidally depressed when I left him, but I'm still afraid that if he committed suicide it would be my fault for leaving. I know that's a terribly selfish thing to think, but god it still keeps me up at night. I know he has other people who are there for him right now, but he was never satisfied unless someone was sacrificing their own well-being to preserve his, and without me to do that... I don't know if he'll be okay.

I don't really need advice on this, I think -- I know this is pretty irrational and I know intellectually that it's not on me, but. I don't know. I just wanted to tell someone who would really get it, I suppose.